Re: GDB does not stop in breakpoint!

[alin.s]

Now I reply the experiment on some unpatched sources, and here is a sure way
to reproduce the "bug" (if it'sa bug)

1. breakpoint in Fx_create_frame
2. run emacs and block X-windows.
3. from a console kill gdb
4. when I return in X, emacs is running , and gdb that started it is dead.

If somebody can explain me in detail what happens when X blocks, please
explain me.




debian:/emacs-gtk/src# gdb ./emacs
GNU gdb 6.8-debian
Copyright (C) 2008 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later
<http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "i486-linux-gnu"...
SIGINT is used by the debugger.
Are you sure you want to change it? (y or n) [answered Y; input not from
terminal]
DISPLAY = :0.0
TERM = xterm
Breakpoint 1 at 0x8147e63: file emacs.c, line 431.
Breakpoint 2 at 0x8168760: file sysdep.c, line 1132.
(gdb) break Fx_create_frame
Breakpoint 3 at 0x811ef98: file xfns.c, line 3129.
(gdb) r -Q
Starting program: /emacs-gtk/src/emacs -Q
[Thread debugging using libthread_db enabled]
[New Thread 0xb725d8c0 (LWP 4971)]
[Switching to Thread 0xb725d8c0 (LWP 4971)]

Breakpoint 3, Fx_create_frame (parms=139100246) at xfns.c:3129
3129      int minibuffer_only = 0;
(gdb) Killed
debian:/emacs-gtk/src#   





Richard Stallman wrote:
> 
>     I put a breakpoint in Fx_create_frame. When I start emacs using "r" ,
> the
>     breakpoint is never reached, and the X windows stops responding.
> 
> There are times, when the screen is grabbed, that stopping the program
> would cause X not to respond.  If you have put the breakpoint at a
> line which is in the middle of a grab, that would explain this.
> 
> Most of the code inside Fx_create_frame is NOT in the middle of a
> grab, and this problem should not happen in those places.
> 
> Can you connect from another machine with ssh and run gdb from
> the other machine?
> 
> 
> 
> 

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